0
An N.C. contact is 'Normally closed'. This applies to relays (electronic switches). You can use either a normally closedcontact or a normally open contact to do what you need, provided the relay has both and depending on your situation. Here's a recent example of mine: A building's fire alarm is wired to the HVAC system to shut down ventilation in case of a fire. In this case we want the HVAC to have power normally but remove power (with the relay) during a fire alarm. We would connect the HVAC power to the relay's N.C. (normally closed) contacts, because they are exactly that: normally closed. This would allow the HVAC to function. When power is applied to the relay, it would switch contacts, disconnecting power to the HVAC. An important note is that contacts and other electrical connections that can change condition (such as a relay) are described in a de-energizedstate. Thus, the N.C. contacts are normally closed, while the power to the relay is off. Likewise, a N.O. contact is open with relay de-energized but will close upon supplying power to the relay.
Wiki User
∙ 15y ago
Wiki User
∙ 15y agoNO is normally open contact, NC is a normally closed contact.
Add your answer:
Earn +20 pts
Why stop button always have NC contact?
When the contacts are Normally Closed (NC) the stop button is "in series" with the supply voltage. By activating the STOP function the contacts open interrupting the flow of current.
How can you make a light bulb go off when a door is opened?
Use a normally closed (NC) contact switch rather than a normally open (NO) momentary contact switch.
Which wire will be connect at NO or NC contact?
NO stands for Normally Open and NC is Normally Closed. It references a switching application. It is the base state of the switch. So if the load is connected to the NC terminal it will usually be energized and when the switching device is activated the circuit will open and the load will be de-energized. The NO terminal would have the load de-energized until the switch was activated and then it would be energized.
What is close contact relay?
A relay is an electrical switch. It consists of a electromagnetic coil and a set of mechanical contacts. Depending on the relay their could be multiple sets of mechanical contacts. The close contact lets current flow through the mechanical contacts when the relay is not turned on. When the relay is turned on current flow is stopped. This is called a normally closed contact or NC The open contact works the opposite of the closed and is referred to as a normally open contact or NO
What is a dry contact and no volt contact in the context of electrical engineering?
A "dry" contact is a contact that is not initially connected to a voltage source. It could be stand-alone, such as a pressure switch mounted on a boiler. Or, if the contact is mounted as part of an electrical unit that has a power source, then the "dry" contact has no pre-wired electrical connection to that power source. For example, a magnetic motor starter may have an extra contact that is not connected to the control circuit that starts and stops the motor. However, when the motor starts, the "dry" contact changes state, because the mechanical action of the starter moves the contact. This "dry" contact could then be wired to devices/circuits that are separate/remote from the motor starter circuits. I do not recognize the term "no volt contact" but I suspect that it is the same thing. A specific type of dry contact in the USA is a "form C" contact which is a three wire contact: Normally Open(NO), Normally Closed (NC), and a Common (C).
Who is the mayor of Greenville NC?
The current mayor of Greenville, Nc is Patricia C. Dunn. If you visit the homesite of Greenville, NC you will find more information about the current mayor and how to contact them.
NC open carry gun laws?
Contact the local police.
Can you use a radar gun in your persnal car in NC?
Contact your local police.
Is there a Dermatologist in Fayetteville NC that accepts medicaid?
Contact the medical society for that county.
How does a normally closed contact work?
De-energize it and note the position of the contacts.
How do you contact the NC postmaster general?
Cheryl Picard, Postmaster 1 Floretta Place Raleigh, NC 27676 Phone: 919-420-5134
How do you contact the postmaster general of nc?
Cheryl Picard, Postmaster 1 Floretta Place Raleigh, NC 27676 Phone: 919-420-5134
What does nc and no mean in electrical terms?
nc: Normally Closed (contact is closed when power is not applied) no: Normally Open (contact is open when power is not applied) Applies to a relay ex...: when power is applied to a relay the no(Normally Open contact will close and allow current to flow between two terminals on relay).
How do i go about applying for section8 in fayetteville,nc...?
Contact Housing Authority of City of Lumberton 900 N Chestnut St, Lumberton, NC - (910) 671-8230
How can i divorce an inmate in the state prison of NC?
You need to contact a lawyer or paralegal. My guess is yes.
used can drink machines in wilmington nc?
For all your used vending machine needs in Wilmington NC, contact Croaker Coffee and Vending? Doug Lewis, 910.251.8051, 1.800.277.3797
What time does the bowling center in Albemarle NC open?
There are a couple bowling centers in Albemarle, NC. Contact Spare Time Lanes & Lounge or Strike Zone Bowlng Ctr
